Glue pot for paper-folding machines



y 7, 1929- H. s. LABOMBARDE 1,711,992

GLUE POT FOR PAPER FOLDING MACHINES Filed Dec. 3, 1927 INVENTOR. HAROLD BLABDMBARDE.

A TTORNEY iii Patented May 7, 1929.

UNITED STATES HAROLD S. LAIBOMBABJSE, F NASHUA, NEW HAMPSHIRE.

GLUE POT FOR PAPER-FOLDING MACHINES.

Application filed December 3, 1927. Serial No. 237,570.

This invention relates to the mechanism employed for applying an adhesive, which will be hereinafter referred to as glue for the sake of brevity, to paper blanks prior to the latter being folded to form boxes, en-

velopes, and the like.

Usually, in box folding or envelope making machines, the blanks, prior to being folded, are passed over a wheel'which carries glue on its periphery. Sometimes, how- 'acter referred to in which, although the amount of glue, or its depth in the pot, is such as to ke'e'p'the glue wheel completely submerged so that it has no exposed portion on which the glue may harden, yet the pressure due to the weight of the deep lot of glue will neither cause an excess quantity to be carried out through the slot in the bottom of the box in operation, nor cause the glue to exude through. said slot when the machine is idle.

:Another object is to provide improved means for controlling the relationship between the glue. wheel and the opening in the bottom of the pot through which it protrudes, as to obtain, accurate adjustment relatively to the scraper which acts on the periphery of the wheel, and to maintain ample width of opening for the wheel to return some of the glue up into the pot, and also to enable the wheel itself to serve to plug up the opening when the machine is at rest.

Another object is to provide for an improved shape of opening through which the wheel protrudes, to permit ready return of excess gluefcarried by the wheel up into the pot.

Another object is to provide a structure which will enable wear of the sides of the outlet openin or slot, or wear of the side faces of the w eel, dueto the glue-hardening, to be compensated for.

Another object is to provide a gluing device which will enable the stripe of glue to be applied closer than heretofore to the crease or score line on which the blank is to be folded to make a box or envelope.

Another object is to provide a gluin device which minimizes the stringing'o the glue from the portions of the wheel rising from the stripe applied to the blank.

With the above and other objects in view, my invention consists in the construction and combination of parts substantially as hereinafter described and claimed.

Of the accompanying drawings Figure 1' is a side elevation of my improved glue pot.

Figure 2 represents a section on line 22 of Figure 1, and illustrating the relationship of the device to the belts which cause the blanks to travel.

Figure 3 represents a section on a line just inside the right hand wall illustrated in Figure 2, and looking in a direction opposite to that of the side elevation Figure 1.

Figure 4 is a plan view of the plates detached from the pot and which plates provide the controlling slot.

Figure 5 is a detail side view, on a larger scale, of the glue wheel to illustrate its ad- 80 justable relationship to the plates shown'in Figure 4.

Figure '6 represents a section on line 66 of Figure 4, on an enlarged scale.

Similar reference characters designate similar parts or features in all of the views.

The glue box or receptacle is so formed that its bottom is inclined bot-h laterally and longitudinally for purposes hereinafter explained. It is illustrated as supported on two cross rods 12 of the machine in which 'it is employed, the box having a hook 13 at one end engaging one of said rods 12 and an arm Mat the other end in which arm one or more screws 15 are mounted to bear on the otherrod 12 to enable accurate adjustment to be effected.

As illustrated by Figures 2 and 3, the box is of such depth relatively to the size of the glue wheel that it will readily contain ample glue to keep the wheel submerged so that glue will not dry. on the wheel when the machine is idle. A partition 17 is provided to divide the box into a glue chamber 18 and a water chamber 19, suitable connec- 105 tions not necessary to illustrate being usually made to either admit steam intothe water chamber and the water therein or to keep up a supply of water in the chamber at a" temperature suflicient to keep the glue in the chamber 18 in a proper conditionof fluid consistency.

The bottom of the chamber 18 is slotted as.at 2]. in order to permit the glue wheel presently described to project below the bottom of the box and also through the slot provided between two plates or strips presently described.

Extending in from one wall of the box, and through the partition 17, is a cylindri cal bearing 22. Rotatively mounted in said bearing 22 is an eccentric bushing 23. A shaft 24 is mounted in said bushing, the outer end having a wheel 25 connected thereto, and the inner end having secured to it the hub 26 of the glue wheel 27. This eccentric mounting is similar to that of Letters Patent No. 1,271,730 issued July 9, 1918 to E. W. Labombarde. It enables the glue wheel to be adjusted relatively to the slot through which it projects, as illustrated by the full and dotted lines Figure 5. Secured to the bottom of the box is a plate comprising two members 28, 29, secured together by screws 30 (Fig. 4) and having between them, at each end, a plurality of thin layers of material 31 such as brass and commomly known as shims. The inner sides of the members 28, 29, are so shaped as to provide a slot for the glue wheel. The portion of said slot through which the descending portion of the wheel passes preferably has parallel walls which closely lit the sides of the wheel, but the portion of the slot through which the rising portion of the wheel passes (Figs. 4 and 5) is wider,

' and the sides of said wider portion diverge downwardly (Fig. 6). Said wider portion of the slot permits sufficiently free return of glue on the wheel up into the pot, and the flaring sides of the slot act to gather any excess of glue that is on the wheel into the upwardly taperin spaces between the sides of the wheel and t e sides of the slot, which excess glue is then dragged up into the pot.

The shims 31 serve to com ensate for wear of the sides of the wheel an the sides of the slot in the scraper member just described. When necessary, the screws 30 are loosened, the member 29 removed, one or more of the thin shims at the ends of the scraper member removed, and the member29 then replaced and secured by the screws 30.

The outer end of the eccentric bushing 23, outside of the glue box, has clamped thereon the hub of an arm 32, the latter having a link 33 pivoted to it at 34, the other end of the link having a suitable handle 35. The lower ed e of the link has notches 36 either one of w ich may be engaged with a pin 37 projecting from the wall of the box. The structure just described is similar to that of the patent referred to. By rotatively adjusting the eccentric bushing 23, the glue wheel can be adjusted for three purposes, viz: to provide ample space at a (Fig. 5) for the return of glue to the box, to obtain accurate adjustment relatively to the scraper edge I), or to closely plug up the slot by the wheel when the machine is idle that no glue will escape.

As the glue pot is capable of use in different types of machines, no particular type is illustrated by the drawings. It is sufiicient for present purposes to explain that each blank such as illustrated at y in Figure 2, and which is to have a stripe of glue applied along its margin by the wheel 27, is carried along by lower and upper belts 38, 39. The upper belt is laterally guided by a stationary strip 40. Usually the blanks are creased or scored parallel with and but a fraction of an inch from their side edges. In Figure 2 the crease line (on. which the blank is to be folded) would be about under the lower edge of the strip 40. It is desirable that the stripe of glue shall be as close as possible to the crease line. This is the reason for the lateral inclination of the glue wheel and preferably also the bottom of the pot as illustrated by Figure 2. Preferably the shaft 24 is correspondingly inclined. The structure described enables the glue wheel, the periphery of which is bevelled to a proper degree to bear properly on the-blank 3 to effect application of a stripe of glue to the blank along a line closer to the crease line than is possible when a glue wheel rotates in a vertical plane and the necessary wall of the pot is between the wheel and the parts of the machine which direct the blanks in their proper line of travel.

To properly drive the shaft of the glue wheel, the periphery of the wheel 25 engages, either frictionally or by means of teeth, the

interior of a recess in a sprocket wheel 41- rotatable on a stud shaft 42 mounted in a portion 43 of the frame or other part of the machine. A drive chain, not necessary to illustrate, engages and actuates the wheel 41. j

The endwise inclination of the bottom of the pot as illustrated by Figure 3 reduces accumulation of strings of glue on the exposed surface of the slotted member at the bottom of the pot. The glue wheel rotates in the direction of arrow on it in Figure 3, and the blanks are carried along by the belts one of which is indicated at 38 in said figure, said blanks being caused to contact with the periphery of the wheel 27 by a thin blade 44 supported by a stud or bracket 45 in a well-known manner. The rotation of the glue wheel, in operation, causes strings theblanks, such larger space permits the strings of glue which are very fine, to remain connected with the glue wheel soas to be carried up into the pot by the wheel, instead of gathering in a collection adhering to the under side of the scraper.

Having now described my invention, I claim 1. A glue receptacle having a slot in its bottom and a wheel projecting down through said slot, said receptacle having a depth sufiiciently exceeding the diameter of the wheel to maintain the wheel completely submerged in glue, and means in permanent position relatively to the wheel to guide blanks singly and successively past and close to the projecting portion of the wheel.

2. A glue receptacle having a slot in its bottom and a wheel projecting down through said slot, said wheel being adjustable to vary its position relatively to the ends of the slot to either permit a film of glue to be carried through the slot by the wheel or to completely plug up the slot by the wheel.

3. A glue receptacle having an opening in .its bottom and a wheel projecting down through said opening, means being provided for compensating for wear of the sides of the wheel and opening.

4. A glue receptacle having a pair-of relatively adjustable plates-at its bottom, said plates being formed to provide a space between them, and a wheel projecting down through said space.

5. The combination with a glue receptacle having an elongated space in its bottom, of a wheel projecting down through said space,

bottom close to a side wall thereof, and a laterally inclined wheel projecting through said slot, said wheel having a bevelled periphery.

9. A glue receptacle having a slot in its bottom, an inclined shaft mounted adjacent to said bottom and having at one end 'a wheel projecting through said slot and having a drive wheel at the other end, and a sprocket, having a recessed side face operatively engaging the drive wheel of the shaft.

10. A glue receptacle having a slot in its bottom and a wheel projecting down through said slot, said receptacle having its bottom inclined upwardly in the direction of movement of the lower portion of the wheel, whereby accumulation of strings of glue during operation is reduced, and means in permanent position relatively to the wheel to guide blanks singly and successively past and close to the projecting portion of the wheel.

In testimony whereof I have aflixed my signature.

HAROLD S. LAB OMBARDE. 

